Unable to solve the instability at joint in the model.I tried partial moment release of the joints.But not able to solve .
Kindly help to solve the issue.
STAAD SPACESTART JOB INFORMATIONENGINEER DATE 20-Jul-21END JOB INFORMATIONINPUT WIDTH 79UNIT MMS NEWTONJOINT COORDINATES1 0 1 0; 2 0 4000 0; 3 0 3300 0; 4 -495 3300 0;MEMBER INCIDENCES1 1 3; 2 3 2; 3 3 4;DEFINE MATERIAL STARTISOTROPIC STEELE 205000POISSON 0.3DENSITY 7.68195e-005ALPHA 1.2e-005DAMP 0.03TYPE STEELSTRENGTH FY 253.2 FU 407.8 RY 1.5 RT 1.2ISOTROPIC RIGIDE 2e+010POISSON 0.3END DEFINE MATERIALMEMBER PROPERTY INDIAN1 2 TABLE FR ISMC150MEMBER PROPERTY INDIAN3 PRIS YD 200CONSTANTSMATERIAL STEEL MEMB 1 2MATERIAL RIGID MEMB 3SUPPORTS1 FIXEDMEMBER RELEASE3 START MP 0.99LOAD 1 LOADTYPE Dead TITLE DLSELFWEIGHT Y -1 JOINT LOAD4 FY -118LOAD 2 LOADTYPE Live REDUCIBLE TITLE SL(OBE)JOINT LOAD3 FX 235LOAD 3 LOADTYPE Live TITLE SL(SSE)JOINT LOAD3 FX 315LOAD 4 LOADTYPE Seismic TITLE EQX(OBE)SELFWEIGHT X 1 SELFWEIGHT Y 1 SELFWEIGHT Z 1 JOINT LOAD3 FX 2353 FY 2353 FZ 2354 FX 1184 FY 1184 FZ 118SPECTRUM SRSS X 0.525 ACC DAMP 0 LIN20 582.7; 4 582.7; 2.85714 699.7; 2.5 782.6; 2.22222 940.1; 2 1064.7;1.66667 1174.1; 1.53846 1266.6; 1.42857 1408.7; 1.25 1538.9; 1.17647 1700.6;1 1895.3; 0.952381 1895.3; 0.869565 1905.1; 0.833333 1973.6; 0.8 2200.7;0.740741 2252; 0.689655 2399.8; 0.666667 2593.2; 0.645161 3076.9; 0.625 3367.1;0.588235 3629.5; 0.555556 4332.3; 0.540541 5035.1; 0.487805 6501.4; 0.47619 7691.3;0.454545 8881.3; 0.425532 12522.9; 0.416667 15266.5; 0.4 18326.2;0.294118 18326.2;0.28169 17471.6; 0.273973 16447.7; 0.27027 16106.3; 0.25974 14115.5;0.25641 13490; 0.253165 12921.6; 0.25 12467.3; 0.246914 12241.4; 0.243902 11789.6;0.235294 9592.6; 0.232558 8905.8; 0.229885 8287.2; 0.227273 7805; 0.210526 6538.9;0.208333 6413.3; 0.206186 6344.6; 0.204082 6463.5; 0.20202 6784.4; 0.19802 7188.4;0.192308 7580.3; 0.190476 8217.4; 0.188679 8536; 0.181818 9019.3;0.18018 9177.5;0.178571 9220.1; 0.175439 9264.2; 0.172414 9408.7; 0.128205 9408.7; 0.126582 9259.6;0.124224 8773.3; 0.123457 8629.3; 0.121212 8332; 0.119048 8104.5; 0.118343 8051.1;0.110497 8051.1; 0.10989 8010.6; 0.108696 7990.8; 0.0930233 7990.8; 0.0909091 7874.3;0.0896861 7719.1; 0.0884956 7374.7; 0.0881057 7305.9; 0.0873362 7091.3;0.0869565 7014.5; 0.0865801 7008.8; 0.0843882 6853.3; 0.0833333 6672.4;0.0823045 6621; 0.0809717 6425.8; 0.0803213 6063.5; 0.08 6036.6; 0.0796813 5982.7;0.0793651 5799.2; 0.0787402 5628.2; 0.078125 5535.5; 0.0775194 5487.1;0.0760456 5238.8; 0.0740741 5063.3; 0.0738007 4973.5; 0.0704225 4731.2;0.0701754 4699.1; 0.0687285 4668.4; 0.0682594 4521.8; 0.0668896 4449.4;0.0591716 4449.4; 0.0446429 3685.7; 0.0378072 3685.7; 0.030303 3557.4;LOAD 6 LOADTYPE Seismic TITLE EQY(OBE)SPECTRUM SRSS Y 0.35 ACC DAMP 0 LIN20 582.1; 4 582.1; 2.85714 669.9; 2.5 757.3; 2 1022.2; 1.66667 1096.9;1.53846 1199.4; 1.42857 1367.6; 1.25 1401.4; 1.17647 1555.9; 1.05263 1676;0.909091 1676; 0.833333 1768.5; 0.8 1876; 0.740741 2016.8; 0.714286 2016.8;0.666667 2098.8; 0.645161 2305.9; 0.588235 2600.3; 0.555556 2849.5; 0.540541 3098.6;0.487805 4185.9; 0.47619 4320.6; 0.454545 4455.3; 0.425532 5706.9; 0.416667 6653.2;0.4 7711.4; 0.377358 7733.2; 0.28169 7733.2; 0.273973 7349.5; 0.27027 7221.7;0.25641 6245.4; 0.253165 6036.5; 0.25 5874.5; 0.246914 5806.1; 0.243902 5669.4;0.238095 5330.8; 0.232558 5127.4; 0.229885 5093.3; 0.192308 5070.5; 0.172414 5070.5;0.169492 4750.4; 0.165289 4746.5; 0.155039 4746.5; 0.152672 4785.5; 0.151515 4837.1;0.150376 4940.2; 0.148148 4958.9; 0.135135 4958.9; 0.133333 5130.1;0.131579 5442;0.12987 5680; 0.129032 5824.8; 0.128205 6114.5; 0.127389 6148.6; 0.125786 6150;0.0930233 6150; 0.0913242 5975.5; 0.0877193 5572.3; 0.0869565 5434.3;0.0843882 5372.2; 0.0833333 5247.6; 0.0823045 5245.7; 0.0809717 5145.7;0.0803213 4839.5; 0.08 4818.6; 0.0796813 4776.8; 0.0793651 4626.7;0.0787402 4485.8;0.0775194 4335.8; 0.0760456 4018.8; 0.0740741 3768.8; 0.0738007 3651.1;0.0724638 3367.1; 0.0704225 3263.3; 0.0701754 3203.1; 0.0687285 3159.4;0.0682594 3039.1; 0.0657895 2941.3; 0.0645161 2793.7; 0.0591716 2793.7;0.0554017 2556.5; 0.0550964 2489; 0.0546448 2473.8; 0.0496278 2473.8;0.030303 1795.5;LOAD 7 LOADTYPE Seismic TITLE EQZ(OBE)SPECTRUM SRSS Z 0.525 ACC DAMP 0 LIN20 387.8; 4 387.8; 2.85714 446.8; 2.5 506.1; 2 667.1; 1.66667 722; 1.53846 771.4;1.42857 897.2; 1.25 924.5; 1.05263 1093.8; 0.869565 1093.8; 0.8 1095.3;0.740741 1199.3; 0.689655 1199.3; 0.555556 1654.8; 0.487805 2421.3; 0.47619 2519.4;0.454545 2617.6; 0.425532 3251.7; 0.416667 3927.6; 0.4 4856.9; 0.377358 4983.2;0.28169 4983.2; 0.27027 4864.9; 0.253165 4569; 0.243902 4565; 0.238095 4454.8;0.20202 4454.8; 0.19802 4511.4; 0.18018 4587; 0.178571 4685; 0.175439 4685.3;0.15873 4685.3; 0.15625 4699.6; 0.152672 4847.6; 0.150376 4907.2; 0.140845 4907.2;0.138889 4940.6; 0.137931 5054; 0.136054 5530; 0.134228 5872.5; 0.133333 6399.4;0.131579 6926.2; 0.129032 7377.2; 0.128205 7662.1; 0.125786 7806.4; 0.125 7989.6;0.124224 8070.6; 0.123457 8111.1; 0.0909091 8111.1; 0.0877193 8071.2;0.0858369 8071.2; 0.0843882 8060.4; 0.0829876 7881.1; 0.0823045 7833.5;0.0809717 7566.9; 0.0806452 7247; 0.08 7182.1; 0.0796813 7117.1; 0.0793651 6876.9;0.0787402 6660.2; 0.078125 6492.1; 0.0775194 6375.8; 0.0772201 6259.4;0.0766283 5979.6; 0.0760456 5767.5; 0.0740741 5418.3; 0.0738007 5234.5;0.0724638 4804.7; 0.0711744 4655.5; 0.0704225 4461.8; 0.0701754 4272.5;0.0687285 4176; 0.0682594 3865.3; 0.0680272 3803.5; 0.0657895 3632.3;0.0649351 3408.8; 0.0591716 3018; 0.0588235 2794.3; 0.0584795 2682.4;0.0526316 2436.2; 0.0522193 2349; 0.030303 1753.9;LOAD 8 LOADTYPE Seismic TITLE EQX(SSE)SPECTRUM SRSS X 0.424 ACC DAMP 0 LIN20 1166.5; 4 1166.5; 2.85714 1379.4; 2.5 1549.2; 2.22222 1853.8; 2 2098.6;1.66667 2301.2; 1.53846 2490.5; 1.42857 2760.7; 1.25 3013.8; 1.17647 3253.1;1.05263 3552.2; 1 3625; 0.909091 3625; 0.833333 3783.3; 0.8 4149.7;0.689655 4335;0.666667 4730.8; 0.645161 5573.6; 0.625 6020.6; 0.588235 6514.4;0.555556 7653.3;0.540541 8792.1; 0.487805 11042.4; 0.47619 12700.3; 0.454545 14358.3;0.425532 18679.3; 0.416667 21873.3; 0.4 25380.7; 0.294118 25380.7;0.28169 24180.1;0.273973 22784.7; 0.27027 22319.5; 0.263158 20502.3; 0.25974 19615.3;0.25641 18771.7; 0.253165 18014.8; 0.25 17431.2; 0.246914 17194.2; 0.243902 16720.3;0.238095 14671.4; 0.235294 13670.4; 0.232558 12716.3; 0.229885 11855.9;0.227273 11182.9; 0.224719 10884.7; 0.222222 10609.7; 0.212766 9734.3;0.210526 9559.5; 0.208333 9442.4; 0.206186 9440.4; 0.204082 9777.7;0.20202 10470.2;0.19802 11180.5; 0.192308 11648.1; 0.190476 12273.3; 0.188679 12585.9;0.185185 12924.3; 0.18018 13272.2; 0.134228 13272.2; 0.131579 13265.2;0.12987 13066.4; 0.126582 12846.8; 0.125786 12731.8; 0.124224 12435.7;0.123457 12308.3; 0.122699 12222.1; 0.121951 12157.3; 0.120482 12120.9;0.119048 11890.7; 0.116959 11711.8; 0.115607 11679.4; 0.110497 11679.4;0.10929 11565.7; 0.108108 11504; 0.0925926 11504; 0.0909091 11431.8;0.0896861 11189.7; 0.0888889 10800.9; 0.0884956 10634.3; 0.0881057 10523.2;0.0873362 10076.8; 0.0858369 9664.7; 0.0851064 9610.2; 0.0843882 9501.2;0.083682 9188.6; 0.0829876 9019.5; 0.0823045 8934.9; 0.0809717 8600.6;0.0806452 8342.7; 0.08 8289.8; 0.0796813 8236.9; 0.0793651 8046.7; 0.078125 7736.9;0.0775194 7658.8; 0.0760456 7259; 0.0740741 7018.9; 0.0738007 6889.3;0.0727273 6632.1; 0.0724638 6590.8; 0.0687285 6455.8; 0.0682594 6354.3;0.0677966 6325.8; 0.0649351 6325.8; 0.0591716 6189.9; 0.0543478 5873.2;0.0526316 5873.2; 0.0508906 5832; 0.0507614 5786.6; 0.050505 5741.1;0.0503778 5695.7; 0.0496278 5647.5; 0.0492611 5525.5; 0.0465116 5342.4;0.045977 5206.6; 0.0457666 5195; 0.0414079 5195; 0.030303 4977.9;LOAD 9 LOADTYPE Seismic TITLE EQY(SSE)SPECTRUM SRSS Y 0.283 ACC DAMP 0 LIN20 1163.5; 4 1163.5; 2.85714 1337.5; 2.5 1514.4; 2.22222 1796.7; 2 2047.5;1.66667 2185.3; 1.53846 2391.3; 1.42857 2729.4; 1.25 2818.6; 1.17647 3087.2;1.05263 3301; 0.909091 3301; 0.833333 3465.6; 0.8 3655.2; 0.740741 3970.3;0.714286 3970.3; 0.666667 4149.5; 0.645161 4566.6; 0.555556 5544.8; 0.540541 5954.7;0.487805 8007.5; 0.47619 8233.9; 0.454545 8460.4; 0.425532 10290.1; 0.416667 11487.7;0.4 12663.2; 0.377358 13254.4; 0.28169 13254.4; 0.273973 12762.2; 0.27027 12598.1;0.25641 11364.3; 0.25 10881.2; 0.246914 10804.8; 0.243902 10652.1; 0.238095 9879;0.235294 9517.5; 0.232558 9206.2; 0.229885 8995.2; 0.190476 8825.2; 0.186916 8825.2;0.165289 8511.7; 0.16 8310.1; 0.133333 8295; 0.131579 8842.5; 0.12987 9193.7;0.129032 9400.1; 0.128205 9813; 0.127389 9861.6; 0.125786 9870.1;0.0930233 9870.1;0.0925926 9753.1; 0.0921659 9698.9; 0.0913242 9644.7; 0.0888889 9353.2;0.0881057 9299.5; 0.0877193 9245.8; 0.0873362 8963.5; 0.0865801 8878.4;0.0858369 8743.7; 0.0843882 8663.2; 0.0840336 8547.4; 0.0833333 8442.4;0.0823045 8442.4; 0.0809717 8399.6; 0.0803213 8046.2; 0.08 8013.7; 0.0796813 7948.8;0.0793651 7691.2; 0.0787402 7504.3; 0.0775194 7317; 0.0772201 7235.9;0.0760456 6763.1; 0.0740741 6347.2; 0.0738007 6143.4; 0.0724638 5655.8;0.0711744 5526.1; 0.0704225 5416.7; 0.0701754 5282.6; 0.0687285 5205.7;0.0682594 4917.5; 0.0680272 4866.2; 0.0657895 4750.1; 0.0647249 4439.2;0.0636943 4394.2; 0.0591716 4394.2; 0.0554017 4239.5; 0.0522193 4062.1;0.0496278 4062.1; 0.0465116 3884.4; 0.0462963 3755.2; 0.0460829 3690.5;0.0458716 3561.3; 0.0431034 3369.3; 0.0414079 3369.3; 0.0348432 3088.4;0.0322061 3088.4; 0.030303 3066.4;LOAD 5 LOADTYPE Seismic TITLE EQZ(SSE)SPECTRUM SRSS Z 0.424 ACC DAMP 0 LIN20 773.3; 4 773.3; 2.85714 890.5; 2.5 1008.9; 2.22222 1183.1; 2 1331.3;1.66667 1435.3; 1.53846 1540.4; 1.42857 1780.4; 1.25 1828.1; 1.17647 1954.3;1.05263 2143.1; 0.869565 2143.1; 0.8 2202.3; 0.769231 2261.4; 0.740741 2381.8;0.689655 2381.8; 0.625 2727.6; 0.588235 2881; 0.555556 3170.1; 0.487805 4637.3;0.47619 4807.7; 0.454545 4978; 0.425532 5643.8; 0.416667 6588.7; 0.4 8034.4;0.377358 8302.4; 0.28169 8302.4; 0.240964 8182.2; 0.238095 8309; 0.178571 8418.9;0.15873 8418.9; 0.15625 8470; 0.151515 8713.7; 0.150376 8830; 0.149254 8830;0.136986 8872.3; 0.136054 9117.3; 0.134228 9679.3; 0.133333 10513; 0.131579 11346.6;0.12987 11926.2; 0.129032 12138.8; 0.128205 12564.1; 0.127389 12645.4;0.125786 13031.8; 0.0930233 13031.8; 0.0925926 13031.1; 0.0921659 12908.2;0.0913242 12785.4; 0.0909091 12662.5; 0.0896861 12576; 0.0888889 12353.8;0.0881057 12242.6; 0.0877193 12131.5; 0.0869565 12040; 0.0843882 12040;0.083682 11958.8; 0.0823045 11907.7; 0.0809717 11627.6; 0.0806452 11282.9;0.08 11184.5; 0.0796813 11086; 0.0793651 10768.2; 0.0787402 10411.4;0.078125 10114.9; 0.0775194 9920; 0.0772201 9725; 0.0766283 9257.8;0.0760456 8893.2;0.0740741 8247.9; 0.0738007 7999.1; 0.0724638 7355.3; 0.0716846 7165.9;0.0711744 7103.8; 0.0704225 6831.2; 0.0701754 6576.8; 0.0687285 6456;0.0682594 6141.6; 0.0657895 6014.8; 0.0645161 5711.9; 0.0641026 5658.3;0.0630915 5415.5; 0.0591716 5213.1; 0.0588235 4789.2; 0.0584795 4577.2;0.0568182 4345.6; 0.0526316 4155.6; 0.0522193 3979.8; 0.0508906 3959.2;0.0503778 3844.4; 0.0496278 3792.6; 0.0483092 3560.8; 0.030303 2871.9;LOAD COMB 10 LC1(OBE)1 1.0 2 1.0 4 1.0 LOAD COMB 11 LC2(OBE)1 1.0 2 1.0 6 1.0 LOAD COMB 12 LC3(OBE)1 1.0 2 1.0 7 1.0 LOAD COMB SRSS 13 LC4(OBE)-1 1.0 -2 1.0 4 1.0 6 1.0 7 1.0 1LOAD COMB 14 LC5(SSE)1 1.0 3 1.0 8 1.0 LOAD COMB 15 LC6(SSE)1 1.0 3 1.0 9 1.0 LOAD COMB 16 LC7(SSE)1 1.0 3 1.0 5 1.0 LOAD COMB SRSS 17 LC8(SSE)-1 1.0 -3 1.0 8 1.0 9 1.0 5 1.0 1PERFORM ANALYSIS PRINT STATICS CHECKFINISH
Cantilevers should not have member releases assigned.
Initially i tried without moment release only. then also i got instability at the same joint.
How to solve this issue.
I suspect that you are using some older version of STAAD.Pro. In the most recent STAAD.Pro CE version 22.06.00.138 this warning should not be reported anymore.
In the older versions, if the basic STAAD.Pro solver is used, this warning is reported due to high stiffness member (RIGID material assigned) connecting to lower stiffness member. I would recommend to use the STAAD.Pro Advance license in order to avoid this warning.
SIr,
More than warning , static loads and reaction forces are not matching in the model.
Any other way to solve this issue .
instead of high stiffness member (RIGID material assigned) connecting to lower stiffness member. Can i go with master slave option.
Kindly correct the model